Dental mallet



(Model.)

No. 283,828. Y

W. G. STBVENSON.

DENTAL MALLET.

Patented Aug. 28, 1883.

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lUuiTnn STaTns BATTNT Trice.

WILLIAM GORDON STEVENSON, OF MORENOI, MICHIGAN.

DENTAL MALLET.

SPECIFICATION forming part of Letters Patent No. 283,828, dated August 28, 18183.

Application led June 30, 1882. (Model.)

To aZZ whom, it may concern,.- f

Be it known that I, WILLIAM GORDON STE- vENsoN, a citizen of the United States, residing at Morenci, in the county of Lenawee and State of Michigan, have invented certain new and useful Improvements in Dental Mallets; and I do hereby declare that the following is a full, clear, and exact description of the samere'fer ence being had to the annexed drawings, making a part of this speeication, and to the letters and figures of reference marked thereon. Figure 1 of the drawings is a side elevation of my invention; Fig. 2, alongitudinal section thereof; and Fig. 3, a detail view, in section, of the tube or casing. l

The present invention has relation to certain new anduseful improvements in automatic mallets for dental purposes-such as condensing gold filling, ne-and has for its object to improve the severaldetails ofconstructiomwhereby the instrument will be rendered more effective in its purpose, readily controlled, and the force of the blow regulated at will without stopping in the work in hand. These several objects I attain by the construction substantially as shown in the drawings, andhereinafter described and claimed.

In the accompanying drawings, A represents the tube or casing, of any desired length and diameter, which is divided into three compartments by the annular flanges a b,secured to the interior of the tube or casing, or castwith it, as preferred. The upper end of the tube or casing A is screw-threaded upon its interior to re- 4ceive the screw-threaded end of a cap, c, to

close said tube, and at the opposite end it is likewise screw threaded to receive a screwthreaded plug, d. The plug d has a central opening or bore for the passage of the toolholder O, the same being of sui'iicient length when at its highest point to pass through and a little beyond the central compartment formed by the iianges a b. The upper compartment contains the hammer B, having the shank e, which is encircled by the actuating-spring f, said shank entering a central hole or bore in the cap c, by which the hammer is guided in its movement.

The tool-holder C (a portion of its length is encircled by a spring, g, and asliding ring, D, which passes around the tube or casing A) is attached to said tool-holder by a tapering or other suitable screw, 7L, the ends of the screw passing through elongated slots i 7c, diametrically opposite each other in the tube or casing.

To the ring D is pivoted a suitable dog, Z, which engages with the circumferential shoulders m, formed upon the periphery of the hammer B, the dog being held in position by a small spring, n, fastened to it, with its free end resting on the sliding ring D.

Io the upper end of the tube or casing A, at the point of termination of the slot i, is an inclined plane, p, for the purpose of releasing the dog from the notches or shoulders m in the hammer B.

Over the lower end of thetube or casing A are placed sleeves E F, the sleeve E being of greater length and fitting closely the tube or casing,while the sleeve F lits loosely and screws into the sleeve E.

To operate the instrument it is properly taken in the hand, with the thumb and forelinger grasping the sleeve E, and when 'pressing down upon the point of the tool r the toolholder will be forced up and carry with it the sliding ring D. rIhe dog l, catching the hammer, will carry it up until released by the inclined plane p, when the spring f will force the hammer B against the tool-holder O, giving a blow proportioned in force to the distance through which the hammer passesV and the' power of thespring. The point of the toolris now raised off the illing or tooth, when the spring yg will force the tool-holder out or downward, carrying with it the sliding ring D and dog Z,which passes over the grooves ,or shoulders as it is carried along. To give a blow of any desired force the sliding ring D is stopped in its downward movement at anypoint desired by pressing the thumb or finger against the ring, and when. it is desired to make the blow of any required force, without pressing the thumb or finger against the sliding ring, the sleeve Fis turned up as high as desired by unscrewing it from the sleeve E.

IIaving thus fully described my invention, wh at I claim as new, and desire to secure by Letters Patent, is-M 1. In a dental mallet or plugger, the combination, with a hamm er having a series of notches or shoulders, and adapted to slide and located within the tube or casing of the instrument, of a ring or sleeve carrying a suitable dog to en IOO gage with the notches or shoulders of the hammer, said sleeve or ring adapted to slide upon the outside of the tube or casing, and operating substantially as and for the purpose set forth.

2. In a dental mallet or plugger, the combination of two sleeves encircling the outer and lower end of the tube or casing of the instru ment, and connected at their inner ends by suitable screw-threads, whereby the force of the blow of the hammer may be regulated by adj ustingthe position of the two sleeves with relation to each other, substantially as described.

3. In a dental mallet or plugger, the combination,with a sliding ring encircling the tube or casing ofthe instrument, and carrying means for operatingasuitable hammer, of two sleeves connected together by screw-threads and encircling the lower endof said tube or casing, the position of the sleeves being regulated or adjusted with relation to each other by means of their screw-threaded connection to regulate the force ofthe blow of the hammer, substanv tially as and for the purpose specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

wiLLAM GoRDoN sTEvENsoN.

Witnesses:

H, S. COLE, J. C. GRABB. 

